vbox5: use gip thread also for timer watchdog

causes the rem timer callback pending check to run more often (every 1 ms
instead 10 ms). This is essential to met the timeout requirements of the
audio backend, which must be checked&run every 5ms.

repos/ports/lib/mk/virtualbox-runtime.mk

@@ -25,7 +25,9 @@ FILTERED_OUT_SRC_CC = RTLogDefaultInit-generic.cpp \
                       RTSemMutexRequest-generic.cpp \
                       RTSemMutexRequestDebug-generic.cpp \
                       RTDirExists-generic.cpp \
-                      RTMpOnPair-generic.cpp
+                      RTMpOnPair-generic.cpp \
+                      RTTimerCreate-generic.cpp \
+                      timer-generic.cpp
 
 CC_WARN += -Wno-unused-variable
 

repos/ports/lib/mk/virtualbox5-runtime.mk

@@ -27,7 +27,9 @@ FILTERED_OUT_SRC_CC = fs-stubs-generic.cpp \
                       RTSemEventMultiWait-2-ex-generic.cpp \
                       RTSemMutexRequest-generic.cpp \
                       RTSemMutexRequestDebug-generic.cpp \
-                      RTTimeLocalExplode-generic.cpp
+                      RTTimeLocalExplode-generic.cpp \
+                      RTTimerCreate-generic.cpp \
+                      timer-generic.cpp
 
 CC_WARN += -Wno-unused-variable